docs: def _unpack_lookupswitch(bc, offset):
      """
      function for unpacking the lookupswitch op arguments
      """
  
      jump = (offset % 4)
      if jump:
          offset += (4 - jump)
  
      (default, npairs), offset = _unpack(_struct_ii, bc, offset)
  
      switches = list()
      for _index in range(npairs):
          pair, offset = _unpack(_struct_ii, bc, offset)
          switches.append(pair)
  
      return (default, switches), offset